Machine tool



May 31,1927. r S. A. COGSDILL MACHINE TOOL Filed March 3.0, 1925 anto/L /L J W/ 6. ff W U ed mw* 1 A. U f. A w u Patented May 31, 1927.

N UNITED STATES STUART A.

PATsNTorri coGsnILL, or nnTrtoIT,` MIcIIIGAmAssreNon To ocGsIJILL MANUFACTUR ING COMPANY, or DETROIT, MICHIGAN, n oorAnTNnnsIrIr.

ranma ce. y

MACHINE IILOOL.

Application mednarcheo, 1925.` serial No. 19,521.

rThe invention relates :to machine tools and refers more particularly to .tools including cutters and holders therefor. One of the objects of the invention is the provision of an improved means for driving the cutter of a tool from its holder whereby an extended driving contact longitudinally of the cutter shank is secured. Another object is the pro? vision of a driving means for the cutter which may be used in reclaimed or salvaged tools when the driving means of the old tools are worn out. TWith these as well a's other objects in view the invention resides in the novel features of construction and combinations and arrangements of parts as more i' with the axial recess 3 of circular cross section and extending from one end thereof for receiving the shank 4 of the cutter. The holder is also provided with the second recess 5 which has the portion 6 of half round cross sectionand extending longitudinally ofand opening into the recess 3, and the portion 7 which has a circular cross section and is located beyond the inner end of the recess 3.

The cutter shank 4 has the longitudinally extending recess 8 in its side and terminating inside its end, this recess `being preferably V-shaped and providing the under cut driving shoulder 9 extending longitudinally `upon the cutter shank. 10 is a pawl engaging in the second recess 5 of the holder and provided with the cylindrical portion 11 journaled in the portion 7 of the recess and the half round portion 12 extending in` the half round portion 6 of the recess. The edge portion 13 of the half round portion of the pawl is adapted to engage in the recess 8 of the cutter shank and contact with the shoulder 9 of the shank to drive the cutter from the holder there being an extended contact between the pa'wl and the shank longitudinally of the latter. A portion of the pawl between the edge portion 13 and the cylindrical portion 11 is cut away as at 14 to receive the solid portion 15 of the cutter shank between its end and the adjacent end of the recess 8 drive is provided for.

whereby the shoulder 16 formed uponithe' inner end of the edge portion 13 `retains the cutter shank from accidental disengagement` The pawl 1s sultably retained inthe holder` as by means of the washer 17 located `inthe end of the holder and secured thereto in a suitable manner such as by peening over the end of the holder. ,This washer has the; opening `18 therein which preferably registers with the recess 3, the arrangement.beingl such that a portion of the washer closes the half round portion 6 of the second recess in the holder.

For normally rotating the pawl about "its longitudinal axis and holding the same in position so that its edge portion 13 engages in the recess 8 of the cutter shank I have provided the coil springl), one end of which is secured to the inner end ofthe pawl and the other end of which issecured to the end of the second recess 5. This coil spring preferably surrounds the pawl shank 20 which extends axially fromthe cylindrical portion llof the pawl and is journaled in the holder beyond the end of the portion 7 of the second recess. i

To assemble the cutter withthe holder the recessed end 4 of the cutter shank is inserted into the recess 3 of the holder and forced over the edge portion 13 of ythe ypawl 10, the end of the cutter shank being preferably beveled for thispurpose; In forcing thel end of the cutter shank over Vthe edge portion of the pawl, the latter is compelled to rotate against the elfortexerted by the spring 19 so that the half round portion 12 of the pawl will lie within the half round `portion 6 of the second recessof the holder, the upper' face of the half round portion being concave with the same radius of curvature as that of the recess 3. When the cutter shank has been forced inwardly into therecess 3 a. sufiicient distance it may be rotated to per- 'mit the edge portion 13 of the half round portion of the pawl to enter into the longitudinally extending recess 8y of the cutter shank under the infiuence of the( coil spring 19. At this time the cutter is assembled with the holder so that the latter may drive the same in a counter clockwise direction as shown in Figure 2, with the lines of force extending in such a direction that a positive Also at this time the cutter shank is held from accidental disengagement from the holder by means of the shoulder 16 upon theipawl engaging the solid portion of the cutter shank beyond its recess. However, the cutter ma)T he disengaged from the `holder hy iirso rotating the cutter sli-ani:

ina counter olooliyise direction as shown in;

Figure Q to thereby rotate the halt round portion ot the paw] baci; into the "half round portion o'l the second recess ofthe holder and then longitudiniilly withdrawing the shank., m l ,I

With the ari'rngeinent `as abover dese ihed it itfillbe seen that the outtor is driven from the"l iolder by; a ineniherhaving an extended= Contact with the cutter shank longitudinallyr thereof. It Will also be seen that the arrangement" is suclrthat `tools hating, `Worn outk driiing connections between the butters and holdersl iiiay 'he reclaimed or salvaged end thereof for receiving said shank, and

hitting asecond recess'exteiiding lofngitudiiially 'of and ooiniiiunieating with; the first nientioiied r'eess, lpatrirotatableabout its loiigitu'diiial`aiiis arrangedto lie Withinfthe u se'condiiecess duringtheasseinhlingoi said shank with" s'aidihol'der and'to entend into the recess in said shank and `have an `eirfeiided @butaca with sind shank insg-aaai nally' thereof `When saidf ushank Vis assembled with said" holder.r

In afinachiiie tool, "the ooniliination ivitli a ciitte'r shank having a longitudinally exteiidiiigrecess in its side, 1of alliolder' havingl a recess veilztendiiig longitudinally from one 'end "thereof for receiving said shank, and having 'a second recess eitending longit'udiiially oi and opening into the iirst nientiond recess, a "nienilier rotatable ahoutits ldiigitudiiial axis," said nfieinherljeingf adapt-` ed' "t lie i Within theseoond recess duringr the assembling' "of said shank with f `said `holder andtoieiitendiiito "the recess in" saidshaiik and to "have 'ani extended i Contact Witli said shank longitudinally thereof Wl'ieii, said shank is asseinbledrvith said liolder`,^'ineans for resiliently rotatiiig said member to extend into therecess insaid shaiikand ineans for retaining said niemher `fromaoeidental disengagement from the sec-sliid recess.

`In a machine tool, the combination with a cutter shank having a longitudinally extending recess in its side and tern'unatiug inside an Q-afl. theres?, el ahelder; lierlse `recess le,eii'tendii1g longitudinally from one end thereof Ylor receiving the recessed end ot saidisllank and having a second halt round recess extending longitudinally of and open- `ihg"int"`tl1e"intentioned recess, and a half round pawl arranged to lie within the second reeess "diiring Hth "asse'xiihling of said shank" with `"said holder one end thereof "for receiving saitl'slianl"antl` having a second halt rotind recess extending longitudinally of and openingfihto'tlie 1iirst mentioned ieoess andfteiiniiiatiiig cular recess beyond "theiiiner end "f first mentioned recess, al pziwvl "engagiiigjn the secondrecessand having d poi'tion`-johi ing af'lialt "round I1portion arranged'to 'lie Within the seeoiid"rece`ss *during the :lssielln` bling ot'saidlshank with 'said holder land to extendii'ito" the recess in saideliaiik aiidto have 'an extended 'Contact `with "saidjslianlr longitudinally thereof when saidslianli assembled `with "said holder, and resilient iiieansfi'or no'rnially rotating saidpawltd extendintothereeess iii saidshanli. 5. In a"`i`na`ehine wtool,"t`l1e `coinbination with a cntter sliiiili hating a longitudinally extending substantially V-sliaped recess "in its side toriniiigan iiiideieut driving shoulder upoiithe cutter shank, of a holder having a recess extending ldngitiidiiially from one end thereof,` `for receiving "saidfshank, tiid having aseeond "recess extending longitudinally of "aiidfopeiii'ng into the' first-"nienu tioiied "recess, apawl havin# aliaif round portion "arranged tolie Wit iin the "seeohd recess during the asseinblingof salidsliank u'iith said shoulder, fone edgeoffsaidv'lialf round portion adapted to eiigagethe underl out shoulder npoii the 'cutter sliankto'rdriving i the cutter from" the holder, and means for retaining the pawl'lrdin accidental disengagement from 'the second recess.`

`In testimony whereof I att'ii: my signature.

- STUART LA; CGSDIIJL.

` and havingh fioril tion arranged to entend intoftherccessin said shank "and to have an extended com` 

